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Патент USA US3024449

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March 6', 1962
E. J. NIELSEN ET AL
3,024,439
TERMINAL BOARD AND COMBINATION THEREOF WITH
TERMINALS AND PROTECTIVE COVER
Filed Jan. 25, 1961
2 Sheets-‘Sheet 1
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March 6, 1962
E. J. NIELSEN ET AL
3,024,439
TERMINAL BOARD AND COMBINATION THEREOF WITH
TERMINALS AND PROTECTIVE covER
Filed Jan. 25, 1961
2 Sheets-Sheet 2
INVENTORS.
?le/K J: N/EZSE/Y
EOBEET D. BOLEY
BY
W.
Zéf'?HTTOE/VEV
States Patent
3,024,439
Patented Mar. 6, 1962
1
2
3,024,439
FIG. 4 is a horizontal sectional view of the board
taken on line 4-4 in FIG. 3; and
FIGS. 5, 6 and 7 are a front elevation, a rear eleva
TERMINAL BOARD AND COMBHNATION THERE
DF WITH TERMINALS AND PROTECTIVE
CUVER
Erik J. Nielsen, Mequon, and Robert D. Boley, Milwau
kee, Wis., assignors to Square D Company, Park Ridge,
llll., a corporation of Michigan
Filed Jan. 25, 1961, Ser. No. 84,879
9 Claims. (Cl. 339-198)
This invention relates to an electrical insulating termi
nal board for electrical devices such as relays and the
like.
rice
.
tion, and a side elevation, respectively, of the board, with
some of the terminals omitted for clearness in illustration.
Referring ?rst to FIG. 1, the board is shown associ
ated with a relay, indicated generally at 1, having a coil
2 and movable contact carriers 3 with movable contacts
4 thereon. The relay circuit includes conductors, such as
10 5, each having at one end a connector tab 6 by which it
is connected to a terminal mounted on the board. The
relay also has resilient tabs 7 which are arranged to bear
against other terminals mounted on the board.
The speci?c types of contacts or connectors on the
More speci?cally, it relates to a terminal board which
supports terminals having connectors at the front or outer 15 terminals depend upon the particular equipment.
The relay is protected by a suitable cover 8 which is
face of the board for connection to external circuits and
arranged for cooperation with the terminal board of the
having contacts at the rear or inner face of the board
present invention, for fully enclosing the relay and the
for associating an electrical device at the inner face of
terminal portions disposed at the rear or inner face of
the board with the external circuits, the device and con
tacts being enclosed by a cover which is connected to the 20 the terminal board.
Referring speci?cally to the terminal board, the board
board and cooperates therewith to protect the enclosed
comprises a rigid body 10 of electrical insulating ma
parts from dust and foreign matter.
terial, such as hard rubber or various types of synthetic
Terminal boards of this general character have been
plastics and the like. The board 10 has a front or outer
provided heretofore. Usually such boards have passages
therein through which the metal terminals must be inserted 25 face 11 and a rear or inner face 12 joined by a periph
eral wall 13.
during the installation on the board. However, it is diffi
For the purpose of supporting the cover 8 in closing
cult to install terminals through such passages by forcing
position, the peripheral wall has a peripheral ?ange por
them endwise therethrough, due to the con?guration of the
tion 14 with its rear face extending outwardly and spaced
terminals themselves, and the contacts and connectors car~
ried at the ends thereof. Furthermore, it is di?icult to 30 rearwardly from the forward face. The wall 13 has a
install these terminals securely and rigidly in position
after insertion.
Terminal boards with slots for receiving strip metal
terminals edgewise, combined with locking strips to hold
peripheral closure portion 15 extending rearwardly from
the ?ange portion 14 to the rear face 12. The ?ange por
tion 14 and seating portion 15 are so arranged that when
the cover 8 is installed, the forward edge of the cover 8
bears against the rear face of the ?ange portion 14 and
the terminals in the slots also have been provided, an ex
the interior wall of the cover snugly embraces the closure
ample being the structure disclosed in US. Patent No.
portion 15.
1,984,036, issued to H. Schwartzmann, December 11,
The body 10 is arranged so that the terminals can
1934.
readily be installed therein. For this purpose, it is pro
In the ‘board of the above identi?ed patent, the termi
nals can be effectively installed in the slots, but not rigid 40 vided with rows of slots 16. The slots extend from the
peripheral wall inwardly of the body at an abrupt angle
ly held in place by the board locking strip and the cover
to the front and rear faces of the body, and also at an
cannot be secured to the board and cooperate with the
abrupt angle to the peripheral wall itself. Preferably,
locking strip to exclude dust from the terminal con
they extend, endwise, at right angles to the peripheral
tacts at the inner face of the board.
In accordance with the present invention, an effective 45 wall and open at their outer ends through the peripheral
wall and extend, sidewise, normal to the front and rear
board and terminal combination is provided in which the
faces 11 and 12 and open therethrough. Thus each slot
terminals can readily be installed and locked ?xedly and
is open at its outer end through the peripheral wall 13
?rmly in position by a locking strip which serves also
and is open at its sides through the front and rear faces
as a gasket between the ‘board and cover secured thereto
'
to prevent access of dust and foreign matter to the in 50 11 and 12, respectively.
The slots 16 are arranged for receiving terminals 18
terior of the cover and to the contacts at the inner face
of the board.
For the purpose of illustration, the board and terminal
having such speci?c connectors, contacts, and the like as
desired on their opposite ends. In the illustrative ex
ample, the terminals 18 are provided at their outer ends,
and with the terminals having contacts for the relay, the 55 at the outer face 11 of the board 10, with conventional
connectors to which wires of an external circuit may be
use of the combination with other devices being apparent
combination is shown as associated with a small relay
attached. At their inner ends, the terminals have con
from the illustrative example.
tacts and connectors for the associated relay 1.
Various other objects and advantages of the present
Since the terminals are essentially the same insofar as
invention will become apparent from the following de
scription wherein reference is made to the drawings, in 60 concerns their mounting in the present board, only one
will be described in detail.
which:
A typical terminal 18 comprises an elongated rigid
FIG. 1 is a perspective view of the terminal board and
strip of conducting metal having at its inner end a con
terminals embodying the principles of the present inven
tact 19 which may be such a contact as to cooperate with
tion, and associated with a relay and adapted to receive
the contact 4. At its outer end, the terminal 18 is pro
a cover for protecting the relay and its contacts;
65
vided with a connector portion 20. This portion has a
FIG. 2 is a side elevation of the board and associated
tapped aperture 21 for receiving a screw 22 of the con
structure illustrated in FIG. 1, showing the cover in
ventional connector clamp 23, whereby a wire of an
place theeron, part thereof being shown in section for
external circuit can readily be clamped to the portion
clearness in illustration;
FIG. 3 is an enlarged exploded perspective view of the
20 at the front or exterior face of the cover. Between
70
terminal board and associated terminals and a combined
the contact 19 and therportion 20, the terminal is pro
locking annulus and gasket used in connection therewith;
vided with an outer or front set of lugs 24 and an inner
3,024,439
3
4
or rear set of lugs 25 for cooperation with the board
10. For this purpose, the board is provided at the inner
ripheral wall portions, such as 37 and 38, are provided
on the board beyond the extremities of the ?ange 14.
The locking strip is so arranged that its periphery at
these portions forms a continuation of the planes of the
end or base of each slot 16 with a socket 26 which ex
tends from the base of each slot inwardly of the board
toward the lateral mid-portion of the board, and which
walls 37 and 38.
opens through the rear face 12. This slot is so arranged
that when the terminal 18 is in operating position in its
slot 16, one of the lugs 25 will seat ?rmly in the socket
26 and thus resist rocking of the terminal in its slot.
The strip 32 may be pressed ?rmly into place and
slot. If desired, suitable projections 27 and 28 may be
terminals 18 themselves, from the portion 30 rearwardly
provided on, and integral with, the front face so as to
engage the edges of the lugs 24 and the face of the ter
of the board.
secured then by rivets, if desired. However, it is found
that suitable pressure sensitive adhesive is adequate for
this purpose, as all forces tending to displace the strip
Generally, the thickness of the lugs 25 in a direction end 10 are directed outwardly endwise of the slots 16 toward the
periphery of the board. The cement is adequate to pre
wise of the slot 16 and normal to the face 12 is such
vent the displacement of the strip 32 in a direction nor
that the lug 25 exactly ?lls the socket 26, leaving that
mal to the rear face 12 and the strip is ?rmly held
adjacent edge of the terminal between lugs 24 and 25
against lateral displacement by its cooperation with the
juxtaposed on the base or inner end of the slot.
The outer lugs 24 are bent at an angle to the plane 15 shoulder 31.
It is apparent, therefore, that when the strip 32 is
of the terminal so that when the terminal is installed in
secured onto the surface 30, it completely closes all por
its slot, they are not aligned with the slot, but engage
tions of the rear edges of the slots, not closed by the
the front or outer face of the board 10 adjacent to the
Since the outer edge of the strip is contiguous with
the peripheral wall portion 15, and the cover extends
minal opposite thereto for helping to hold the terminal
from the ?ange 14 rearwardly, the outer periphery of
in proper position.
the strip is engaged by the inner wall of the cover, thus
The terminals 18 preferably are receivable laterally
edgewise in the slots 16, respectively, and when fully 25 completely blocking access into that portion of the space
within the cover which is rearwardly from the por
seated in the slots, they extend, endwise of the terminals,
tion 30.
outwardly from and beyond the front or outer face 11
In some instances, it may be desired to reinforce the
and the rear or inner face 12, respectively, of the board
10.
The inner side walls of each slot 16 are provided with
strip 32 against outward edgewise distortion.
a plurality of integral ridges 29. These ridges compen
outwardly edgewise of the strip, and the board is pro
vided with lugs 41 adapted to be received in and snugly
sate for manufacturing inaccuracies and thereby assure
a good squeeze ?t on the faces of the terminal. They
can be sheared ofl’ partially by the terminal as it passes
In such
a case, the strip is provided with cutouts 40 which open
?t the cutouts.
In such instances, the outermost sur
faces of the lugs, edgewise of the strip, form continua
edgewise into the slot 16 should they obstruct its path. 35 tions of the peripheral wall portion 15 rearwardly from
the portion 30. Consequently, when the cover is in place,
The outermost edges of the lugs 24 and 25, when the
its side wall is engaged about its entire inner periphery
terminals 18 are fully installed in their slots, are dis
by the portion 15 and edge of the strip 32, thus provid
posed inwardly from the peripheral seating wall 15 of the
board.
At their outer extremities, the board has a
marginal seating portion 30 which preferably is parallel
to the rear face 12 and offset a slight distance there
from toward the forward face.
This outer marginal
ing an effective obstruction to the entrance of dust into
40 the interior of the cover.
Having thus described our invention, we claim:
1. A terminal board including a body having a front
face and a rear face, and a peripheral wall, said body
having a row of slots therein, each slot extending from
seating portion extends from the outer ends of the lugs
25 to the peripheral closure portion 15 and is peripherally
continuous. It is adapted to receive a locking strip for 45 the peripheral wall inwardly of the body at an abrupt
angle to said faces and at an abrupt angle to the periph
holding the terminals against edgewise displacement out
eral wall, each slot being open at its outer end through
wardly endwise of the slots 16. The terminals, as men
the peripheral wall and open at its sides through the front
tioned, are held by the lugs 24 and 25 against displace
face and rear face, terminals having portions receivable
ment endwise of the terminals.
laterally edgewise in said slots, respectively, through the
The marginal portion 30 is exposed rearwardly of the
outer ends of the slots and snugly accommodated therein,
board 10. An abrupt ‘shoulder 31 is disposed at the
with portions of each terminal extending lengthwise of
inner limit of the portion 30. The portion 30 is accessi
the terminal outwardly from and beyond said faces, said
ble from the rear face of the board so that it can re
body and each terminal having portions with comple
ceive an annular combined locking strip and dust gasket
32 by movement of the gasket in a direction toward the 55 mentary shoulders engageable with each other for con
straining the terminals from movement endwise of the
portion 30 while the gasket is held generally parallel
terminals in said slots, said body having at the rear face
to the rear face 12 of the board and to its own installed
position on the portion 30.
The outer edges of the lugs 24 and 25, when the ter
minals are fully seated, are disposed at the inner limit
of the portion 30 and extend rearwardly from the general
a seating portion extending from the outer lateral edge
of the terminals, edgewise of the terminals, outwardly
toward the adjacent peripheral wall of the body and pro
plane thereof.
The combined locking strip and gasket 32 comprises
rearwardly and accessible so that it can receive a locking
an annulus or frame of insulating material which is rela
viding a seat for a locking strip, said seat being exposed
strip by movement of the strip in a direction toward, and
generally normal to, the rear face, while the strip is
tively hard, but slightly bendable. The inner periphery 65 parallel to its installed seated position on the seat, a
33 of the strip 32 ?ts snugly against the peripheral shoul
locking strip so receivable and seated on said seat, and
der 31. The outer peripheral wall 34 of the strip 32 is
means securing the strip in ?xed position on the body.
disposed so that it forms a continuation rearwardly of
2. A terminal board according to claim 1 wherein at
the peripheral wall portion 15 when the annulus is in 70 least one of the opposed aligned respective face portions
stalled. The strip preferably has ?at front and rear faces
of the walls of each slot by which its associated terminal
35 and 36, respectively, the front face being juxtaposed
is engaged when the terminal is in operating position
?rmly against the peripheral portion 30 when the strip
therein is provided with small integral protuberances
is installed. In some instances, the ?ange 14 does not
which extend slightly into the slot to compensate for
continue around the entire periphery. Instead, the pe 75 variations in manufacturing tolerances of the terminal
5
3,024,439
6
and slot while assuring a snug ?t of the terminal in the
slot.
3. A terminal board according to claim 2 wherein the
protuberances are ridges extending at acute angles to the
length of the installed terminal.
4. A terminal board according to claim 1 wherein the
slots in the body are arranged in rows at opposite margins
having rows of slots therein at opposite margins thereof,
each slot of each row extending from the peripheral wall
at its associated margin inwardly at an abrupt angle to
said faces and at an abrupt angle to its said associated
peripheral wall, each slot being open at its outer end
through its associated peripheral Wall and open at its
sides through the front face and rear face and adapted to
thereof, said seating portion is peripherally continuous and
receive portions of terminals laterally of the board edge
surrounds the outer edges of the terminals, and the lock
Wise in said slots, respectively, through the outer ends of
ing strip is peripherally continuous and is receivable on 10 the slots and snugly accommodate them therein so that
the seat by movement thereonto in said normal direction
said portions of each terminal will extend lengthwise of
while parallel to its said installed seated position.
the terminals outwardly from and beyond said faces,
5. A terminal board according to claim 4 wherein the
said body having at the rear face a seating portion dis
strip is of relatively still, but slightly resilient, material.
posed outwardly from the base of the slots and extending
y6‘. A terminal board according to claim 4 wherein the
from the outer limits of the portions of the slots which
rear face of the margin forming the seat is offset from 15 are to accommodate the terminals, endwise of the slots,
the remainder of the rear face in a direction toward the
outwardly toward the peripheral wall and coextensive
front face.
peripherally of the body with the peripheral wall, and
7. A terminal board according to claim 6 wherein an
providing a seat for a peripherally continuous locking
abrupt shoulder facing outwardly toward the periphery 20 strip, said seat being exposed rearwardly and accessible
of the body is provided which extends ‘from the inner edge
so that it can receive said locking strip by movement of
of the offset marginal rear face and the outer edge of the
the strip in a direction toward, while the strip is gen
remainder of the rear ‘face, the slots open through said
erally normal to, the rear ‘face, a peripherally continuous
shoulder, and portions of the outer lateral edges of the
locking strip so receivable and seated on said seat and
terminals extend outwardly endwise of the slots slightly 25 closing the ‘sides of the slots at the rear face outwardly
beyond said shoulder, and the inner periphery of the con
from said outer limits to the peripheral wall, and means
tinuous strip snugly engages said portions of the lateral
securing the strip in ?xed position on the body.
edges and yieldably urges the terminals edgewise in the
slots inwardly of the body.
8. A terminal board according to claim 7 wherein each 30
terminal has opposed shoulders at its inner edge spaced
from each other endwise of the terminal, and said body
has a portion receivable snugly between said shoulders.
9. A terminal board including a body having a front
face and a rear face, and a peripheral wall, said body
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,495,267
Larson _______________ __ Jan. 24, 1950
FOREIGN PATENTS
35
557,756
Belgium ____ _________ __ June 15, 1957
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